Seehra Mohindar S, Narang Vishal, Geddam Usha K, Stefaniak Aleksandr B
Department of Physics & Astronomy, West Virginia University, Morgantown, WV 26506, USA.
National Institute of Occupational Safety and Health, Morgantown, WV 26505, USA.
Carbon N Y. 2017 Jan;111:380-384. doi: 10.1016/j.carbon.2016.10.010. Epub 2016 Oct 8.
Structural properties of sixteen (16) commercial samples of graphene-based materials (GBM) labelled as graphene, graphene oxide or reduced graphene oxide are investigated at room temperature using X-ray diffraction (XRD) and Raman spectroscopy. Based on the observed correlation between the results obtained with these two techniques, these samples are classified into three groups: Group A of seven samples consisting of graphitic nanosheets with evaluated thickness ≃20 nm and exhibiting both the 2H and 3R phases in XRD; Group B of six samples exhibiting XRD spectra characteristic of either graphene oxides (GO) or carbons with some order; and Group C of three samples with XRD spectra characteristic of disordered carbons. The relative intensities and widths of D, G, D', 2D and (D + D') bands in the Raman spectra are equally distinguishable between the samples in groups A, B and C. The width of the D-band is the smallest for Group A samples, intermediate for group B and the largest for group C samples. The intensity ratio I(D)/I(G) of the D and G bands in the Raman spectra of the samples is used to quantify the Raman-active defects whose concentration increases in going from samples in Group A to those in Group C.
使用X射线衍射（XRD）和拉曼光谱在室温下研究了十六（16）种标记为石墨烯、氧化石墨烯或还原氧化石墨烯的商业石墨烯基材料（GBM）样品的结构特性。基于用这两种技术获得的结果之间观察到的相关性，这些样品被分为三组：A组有七个样品，由评估厚度约为20 nm的石墨纳米片组成，在XRD中呈现2H和3R相；B组有六个样品，呈现出氧化石墨烯（GO）或具有一定有序度的碳的XRD光谱特征；C组有三个样品，具有无序碳的XRD光谱特征。A、B和C组样品的拉曼光谱中D、G、D'、2D和（D + D'）带的相对强度和宽度同样可区分。A组样品的D带宽度最小，B组居中，C组样品最大。样品拉曼光谱中D和G带的强度比I（D）/I（G）用于量化拉曼活性缺陷，其浓度从A组样品到C组样品逐渐增加。
